template<class T> T abs (const complex<T>& x);
Absolute value of complex
Returns the absolute value of the complex number x.
The absolute value of a complex number is its magnitude (or modulus), defined as the theoretical distance between the coordinates
(real,imag) of x and
(0,0) (applying the Pythagorean theorem).
This function is overloaded in <cstdlib> for integral types (see cstdlib abs), in <cmath> for floating-point types (see cmath abs), and in <valarray> for valarrays (see valarray abs).
- Complex value.
The absolute value of x.
T is the type of the components of the complex type (i.e., its value type).
// abs complex example
#include <iostream> // std::cout
#include <complex> // std::complex, std::abs
int main ()
std::complex<double> mycomplex (3.0,4.0);
std::cout << "The absolute value of " << mycomplex << " is " << std::abs(mycomplex) << '\n';
The absolute value of (3,4) is 5
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